add demo project
add dem.gitignore
fixed the I2C slave address of SX1505

it is wrong in the datasheet ADDR = 0x20
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there is no LED backlight in this demo board
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0X007 – OUTPUT CTRL I

BIT 7 - FP data port FPR(Red color) and FPB(Blue color) swapping
control.
1 = swapped  0 = normal
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uncomment the SUPPORT_FOSD_MENU to start the OSD menu
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